From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id 73CC76B0038 for ; Wed, 4 Mar 2015 18:51:54 -0500 (EST) Received: by pdjz10 with SMTP id z10so10395824pdj.11 for ; Wed, 04 Mar 2015 15:51:54 -0800 (PST) Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net. [150.101.137.143]) by mx.google.com with ESMTP id tw10si7002966pac.68.2015.03.04.15.51.52 for ; Wed, 04 Mar 2015 15:51:53 -0800 (PST) Date: Thu, 5 Mar 2015 10:51:26 +1100 From: Dave Chinner Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation. Message-ID: <20150304235126.GB18360@dastard> References: <20150303052004.GM18360@dastard> <20150303113437.GR4251@dastard> <20150303134346.GO3087@suse.de> <20150303213353.GS4251@dastard> <20150304200046.GP3087@suse.de> <20150304230045.GZ18360@dastard> <20150304233544.GA24733@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150304233544.GA24733@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar Cc: Mel Gorman , Linus Torvalds , Andrew Morton , Matt B , Linux Kernel Mailing List , linux-mm , xfs@oss.sgi.com On Thu, Mar 05, 2015 at 12:35:45AM +0100, Ingo Molnar wrote: > > * Dave Chinner wrote: > > > > After going through the series again, I did not spot why there is > > > a difference. It's functionally similar and I would hate the > > > theory that this is somehow hardware related due to the use of > > > bits it takes action on. > > > > I doubt it's hardware related - I'm testing inside a VM, [...] > > That might be significant, I doubt Mel considered KVM's interpretation > of pte details? I did actaully mention that before: | I am running a fake-numa=4 config on this test VM so it's got 4 | nodes of 4p/4GB RAM each. but I think it got snipped before Mel was cc'd. Perhaps size of the nodes is relevant, too, because the steady state phase 3 memory usage is 5-6GB when this problem first shows up, and then continues into phase 4 where memory usage grows again and peaks at ~10GB.... Cheers, Dave. -- Dave Chinner david@fromorbit.com -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org